Hi John, On Wed, May 20, 2020 at 1:53 AM John Donnelly <john.p.donnelly@xxxxxxxxxx> wrote: > > > > > On May 19, 2020, at 5:21 AM, Arnd Bergmann <arnd@xxxxxxxx> wrote: > > > > On Thu, Mar 26, 2020 at 4:10 AM Chen Zhou <chenzhou10@xxxxxxxxxx> wrote: > >> > >> Hi all, > >> > >> Friendly ping... > > > > I was asked about this patch series, and see that you last posted it in > > December. I think you should rebase it to linux-5.7-rc6 and post the > > entire series again to make progress, as it's unlikely that any maintainer > > would pick up the patches from last year. > > > > For the contents, everything seems reasonable to me, but I noticed that > > you are adding a property to the /chosen node without adding the > > corresponding documentation to > > Documentation/devicetree/bindings/chosen.txt > > > > Please add that, and Cc the devicetree maintainers on the updated > > patch. > > > > Arnd > > > >> On 2019/12/23 23:23, Chen Zhou wrote: > >>> This patch series enable reserving crashkernel above 4G in arm64. > >>> > >>> There are following issues in arm64 kdump: > >>> 1. We use crashkernel=X to reserve crashkernel below 4G, which will fail > >>> when there is no enough low memory. > >>> 2. Currently, crashkernel=Y@X can be used to reserve crashkernel above 4G, > >>> in this case, if swiotlb or DMA buffers are required, crash dump kernel > >>> will boot failure because there is no low memory available for allocation. > >>> > >>> The previous changes and discussions can be retrieved from: > >>> > >>> Changes since [v6] > >>> - Fix build errors reported by kbuild test robot. > > ... > > > Hi > > We found > > https://lkml.org/lkml/2020/4/30/1583 > > Has cured our Out-Of-Memory kdump failures. > > From Henry Willard > Subject [PATCH] mm: Limit boost_watermark on small zones. > > I am currently not on linux-kernel@xxxxxxxxxxxxxxx. dlist for all to see this message so you may want to rebase and see if this cures your OoM issue and share the results. This is a very interesting finding. Thanks a lot for sharing the same. I am working on further avoiding OOM issues with arm64 kdump kernels. I will experiment more with this patch and get back with more details. Regards, Bhupesh
